local num_array = {1,2.0}
for _, value in pairs(num_array) do
    print(_,math.type(value))
end
print(0xff)
io.write(string.format("%a",419))
-- _G.变量名 _G['变量名']
-- _虚变量 复制给没用的值
info = 1
print(_G['info'])
print([[
    hello
]])
print(1 ~= 2)
print(#num_array)